E-10 / E-11 / Loss of AI Analog Input Signal Loss fault in Toshiba drive
E-10 / E-11 / Loss of AI Analog Input Signal Loss fault in Toshiba drive
Description This fault occurs when the drive is set to receive a speed reference from an external source (like a PLC providing 4-20mA or 0-10V) and that signal drops below a minimum threshold. For a 4-20mA signal, if the current drops to 0mA or 2mA, the drive infers a "Broken Wire" condition. It is a safety feature to prevent the drive from acting unpredictably when control is lost. E-10 usually refers to the VI input (Voltage) and E-11 to the II input (Current), depending on the model. Causes
1. Broken Wire: The signal cable from the PLC or potentiometer has been cut or disconnected.
2. Source Failure: The PLC analog output card has failed or lost power.
3. Loose Terminal: The screw on the terminal block (CC, VI, II/RR) is loose.
4. Dip Switch Mismatch: The hardware dip switch on the VFD control board is set to Voltage (V) while the parameter is expecting Current (I), or vice versa. Solution Use a multimeter to measure the signal at the drive terminals.
- For 4-20mA: Set meter to DC Amps (series) or DC Volts (parallel across a 250/500 ohm resistor if internal). If you read 0mA, go to the source (PLC) and measure there. If the PLC is sending 12mA but the drive sees 0mA, the wire is broken.
- For 0-10V: Measure DC Volts across the input terminal and Common (CC).
Check the hardware switches. On Toshiba VF-S15 or AS1 drives, there is a physical switch labeled "SW1" or "V/I". Ensure it matches your wiring. If you are feeding a 4-20mA signal, the switch MUST be on "I". If it is on "V", the signal will not be read correctly and may trip.
If the signal loss is intermittent (noise), use shielded twisted pair cable and ground the shield at the drive end only. You can also change the drive's behavior upon signal loss (Parameter F633 usually). You can set it to "Stop," "Run at Last Good Speed," or "Run at Preset Speed" depending on how critical the process is.
Description This fault occurs when the drive is set to receive a speed reference from an external source (like a PLC providing 4-20mA or 0-10V) and that signal drops below a minimum threshold. For a 4-20mA signal, if the current drops to 0mA or 2mA, the drive infers a "Broken Wire" condition. It is a safety feature to prevent the drive from acting unpredictably when control is lost. E-10 usually refers to the VI input (Voltage) and E-11 to the II input (Current), depending on the model. Causes
1. Broken Wire: The signal cable from the PLC or potentiometer has been cut or disconnected.
2. Source Failure: The PLC analog output card has failed or lost power.
3. Loose Terminal: The screw on the terminal block (CC, VI, II/RR) is loose.
4. Dip Switch Mismatch: The hardware dip switch on the VFD control board is set to Voltage (V) while the parameter is expecting Current (I), or vice versa. Solution Use a multimeter to measure the signal at the drive terminals.
- For 4-20mA: Set meter to DC Amps (series) or DC Volts (parallel across a 250/500 ohm resistor if internal). If you read 0mA, go to the source (PLC) and measure there. If the PLC is sending 12mA but the drive sees 0mA, the wire is broken.
- For 0-10V: Measure DC Volts across the input terminal and Common (CC).
Check the hardware switches. On Toshiba VF-S15 or AS1 drives, there is a physical switch labeled "SW1" or "V/I". Ensure it matches your wiring. If you are feeding a 4-20mA signal, the switch MUST be on "I". If it is on "V", the signal will not be read correctly and may trip.
If the signal loss is intermittent (noise), use shielded twisted pair cable and ground the shield at the drive end only. You can also change the drive's behavior upon signal loss (Parameter F633 usually). You can set it to "Stop," "Run at Last Good Speed," or "Run at Preset Speed" depending on how critical the process is.
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